Bulletin of the American Physical Society
60th Annual Meeting of the APS Division of Plasma Physics
Volume 63, Number 11
Monday–Friday, November 5–9, 2018; Portland, Oregon
Session TP11: Poster Session VII: Basic Plasma Physics: Pure Electron Plasma, Strongly Coupled Plasmas, Self-Organization, Elementary Processes, Dusty Plasmas, Sheaths, Shocks, and Sources; Mini-conference on Nonlinear Waves and Processes in Space Plasmas - Posters; MHD and Stability, Transients (2), Runaway Electrons; NSTX-U; Spherical Tokamaks; Analytical and Computational Techniques; Diagnostics (9:30am-12:30pm)
Thursday, November 8, 2018
OCC
Room: Exhibit Hall A1&A
Abstract ID: BAPS.2018.DPP.TP11.114
Abstract: TP11.00114 : Impurity concentrations and transport in LTX plasmas fully surrounded by liquified lithium surfaces*
Presenter:
Dennis P Boyle
(Princeton Plasma Phys Lab)
Authors:
Dennis P Boyle
(Princeton Plasma Phys Lab)
Ronald E Bell
(Princeton Plasma Phys Lab)
Paul E Hughes
(Princeton Plasma Phys Lab)
Matthew J Lucia
(Princeton Plasma Phys Lab)
Dick Majeski
(Princeton Plasma Phys Lab)
E. Merino
(Princeton Plasma Phys Lab)
John C Schmitt
(Auburn Univ)
Filippo Scotti
(Lawrence Livermore Natl Lab)
Christopher Hansen
(Univ of Washington)
R. Kaita
(U. Tennessee)
Shigeyuki Kubota
(Univ of California - Los Angeles)
Theodore Mathias Biewer
(Oak Ridge National Lab)
Drew B Elliott
(Oak Ridge National Lab)
Travis Gray
(Oak Ridge National Lab)
The first successful operation of a tokamak almost fully surrounded by liquified lithium surfaces was achieved in the Lithium Tokamak Experiment (LTX), prior to its upgrade to LTX-β. While early attempts at operating with lithium coatings above the melting temperature suffered poor performance due to excessive impurities, improved techniques for lithium evaporation and wall/vacuum-conditioning allowed for operation at 260 ℃. Here we present new analysis of lithium, carbon, and oxygen impurity profiles in the experiments with liquified lithium coatings, and compare them to previous measurements with solid coatings. Preliminary analysis shows similar, but modestly higher impurity concentrations with liquified Li. Enhanced diagnostics in LTX-β, including improved spectroscopy and Thomson scattering systems, will enable detailed measurements in a wider parameter space of plasma and surface conditions. Analysis and comparison of impurity profiles and transport will be presented.
*This work supported by US DOE contracts DE-AC02-09CH11466, DE-AC05-00OR22725, and DE-AC52-07NA27344.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DPP.TP11.114
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